Cam or pulley fastening.



UNITED STATES PATENT EEICE.l

'WILLIAM O. DAVIS, OF DENVERCOLORADO.

CAMoR lPULLEY I-'As'rI-:VNmle` SPECIFICATION formingpart of Letters Patent No. 634,660, dated October 10, 1899.y Application iiled February 23 1893. Serial No. 671,301` (No model.)

T0 @ZZ whom, it may concern:

Be it known that I, WILLIAM: C. DAvIs, a citizen 0f the United States, residing at Denver, county of Arapahoe, State of Colorado, have invented certain new and useful Improvements in Cam or Pulley Fastenings, of which the following is a specification.

My invention relatesto improvements in means for' securing cams, pulleys, or the like to shafts.

The object of the invention is to provide a construction such that when the key or Wedge and the hub of the cam or pulley are in place upon the shaft aslight turn will Wedge or bind the hub tightly on the shaft, absolutely preventing further movement and always locking it at exactly the same point.

A further object is to provide a construction in which the wedge-block or key will always have a full bearing both in the hub and shaft.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a cam in place upon a shaft. Fig. 2 is a sectional view taken through the hub, shaft, .and block or key. Fig. 3 is a similar view showing the cam keyed against movement in the opposite direction. Fig. 4 isan end view of the huh with the shaft removed.

Referring to the drawings, A represents the hub of a cam or other similar device, and B the shaft to which it is to be secured. The hub is bored out to accurately iit upon the shaft, as shown in Fig. l, and in addition is provided on its inner periphery, midway between the sides or edges, with an eccentric groove or channel a, deepest in the centerV and gradually decreasing in depth toward each end. The shaft is provided with a keyseat h in the face thereof, having a curved bottom, and within this is seated the Wedgeblock or key, which has a face curved to correspond exactly With the curve of the keyseat. The other face of the key is curved to correspond exactly with the curved face of the eccentric groove, and in practice it is desirable to form the face of the eccentric groove or channel .on the same curve as the key-seat and the two faces of the key identical. The hub is cut away, as shown at c' in Fig. 4, to

permitit to be slipped on the shaft and over the key until the key or wedge-block is in line with the eccentric groove orchannel, when a slight turn of the'hub in either direction securely locks it against further movement in that direction, the key sliding in its key-seat until the outer face y positions itself so as to be exactly concentric with the adjacent portion of the eccentric channehthus affording a bearing of the full width of the key both between the key and its seat and the outer face of the key and the eccentric channel, as clearly shown in Figs. 2 and 3.

Having thus described my invention, what I claim isl. In combination, the shaft and the hub mounted thereon, one of said parts having a curved key seat or recess, and a Wedge-block or key seated in said key-seat and having a curved outer face, the other of said parts having au eccentric surface corresponding to the curve of the said outer face of the key, substantially as described.

2. In combination,the shaft havin gacurved recess therein, the hub having an eccentric groove or channel, and the wedge-block having one face curved to correspond to the recess and the other face curved to correspond to the curve of the eccentric groove, substantially as described.

3. In combination ,the shaft having a curved 4block loosely seated in said recess, said hub having a cut-away portion to permit the entrance of the key, substantially as described.

In testimony whereof I aii'ix my signature in presence of two witnesses.

WILLIAM c. Davis.

lVitnesses:

JOHN R. MAnIUs, EDITH MCATEE. 

